Time Response of Reactive Circuits

Referring this figure, on the falling edge,

A the resistor voltage drops to –5 V and then goes back to zero exponentially

B the resistor voltage jumps to –5 V and then goes back to zero exponentially

C the capacitor voltage remains constant

D the resistor voltage jumps to +5 V and then decreases exponentially to zero

ANS:B - the resistor voltage jumps to –5 V and then goes back to zero exponentially

The capacitor charges as +ve peak is received at +plate, the C charges and then it discharges as the impulse of +5V deceases through -ve plate providing -ve peak to resistor.

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